var Buer = false;
console.log(Buer); //布尔值
var aa = 9;
console.log(aa); //数字
var b = '999';
console.log(b); //字符串
var arr = [1, 2, 3];
console.log(arr); //數組
var arr1;
arr1 = ['hello', 2];
console.log(arr1); //元组
var fun1 = function (a, b) {
    var bb = a + b;
    return bb;
};
console.log(fun1(1, 5), '1,2,3'); //约束函数返回值
